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0,25 * 1200 + 125 * 1,5 * 2 - 250 * 2,6
= 0,25 * 100 * 12 + 25 * 5 * 3 - 25 * 10 * 2,6
= 25 * 12 + 25 * 15 - 25 * 26
= 25 * ( 12 + 15 - 26)
= 25 * 1 = 25
\(0,25\cdot1200+125\cdot1,5\cdot2-250\cdot2,6=\)
\(300+375-650=25\)
\(2\times\left(\frac{2}{5}\times x+0,2\times x\right)-1,5=\frac{3}{2}:\frac{1}{5}.\)
\(2\times\left(\frac{2}{5}\times x+\frac{1}{5}\times x\right)-\frac{3}{2}=\frac{15}{2}\)
\(2\times\text{[}x\times\left(\frac{2}{5}+\frac{1}{5}\right)]-\frac{3}{2}=\frac{15}{2}\)
\(2\times\left(x\times\frac{3}{5}\right)-\frac{3}{2}=\frac{15}{2}\)
\(2\times\left(x\times\frac{3}{5}\right)=\frac{15}{2}+\frac{3}{2}\)
\(2\times\left(x\times\frac{3}{5}\right)=9\)
\(x\times\frac{3}{5}=9:2\)
\(x\times\frac{3}{5}=4,5\)
\(x=4,5:\frac{3}{5}\)
\(x=7,5\)
a) X + 1/4 = 5/8 + 2/5
X + 1/4 = 41/10
X = 41/10 - 1/4
X = 31/40
b) X : 3/4 = 4/10 - 4/10
X : 3/4 = 0
X = 0
c) X + 3,4 x 2,6 = 4,8 x 5,2
X + 8,84 = 24,96
X = 24,96 : 8,84
X = 48/17
d) X : 1,5 + 1,5 = 0,8N x 2
= bó tay nhé
12,6 x 2,6 x 3 - 2,6 x 5,8 - 2,6 x 2
= 2,6 x (12,6 x 3 - 5,8 - 2)
= 2,6 x 30
= 78
a: x:3,2+3,6=9,6:1,2
=>x:3,2+3,6=8
=>x:3,2=8-3,6=4,4
=>\(x=4,4\cdot3,2=14,08\)
b: \(25,4+5x=313,5+4,4\)
=>\(5x+25,4=317,9\)
=>\(5x=317,9-25,4=292,5\)
=>\(x=\dfrac{292.5}{5}=58,5\)
c: \(12,5\cdot x-56,5=75,8\cdot2\)
=>\(x\cdot12,5-56,5=151,6\)
=>\(x\cdot12,5=151,6+56,5=208.1\)
=>\(x=\dfrac{208.1}{12.5}=16,648\)
d: \(3,84\cdot x-4,2=22,5:1,5\)
=>\(3,84x-4,2=15\)
=>3,84x=15+1,2=16,2
=>x=16,2/3,84=4,21875
e: 22,5*x=31,5*2,6
=>x*22,5=81,9
=>x=81,9/22,5=3,64
a. 0,2 * x + 0,4 * x = 12
(0,2 + 0,4) * x = 12
0,6 * x = 12
x = 12 : 0,6
x = 60
\(0,2\times x+0,4\times x=12\)
\(x\times\left(0,2+0,4\right)=12\)
\(x\times0,6=12\)
\(x=12\div0,6\)
\(x=20\)
\(\left(x-4,5\right)+\left(x+3,5\right)+\left(x-1,5\right)=2\)
\(x-4,5+x+3,5+x-1,5=2\)
\(x+x+x+3,5-4,5-1,5=2\)
\(x\times3=2+1,5+4,5-3,5\)
\(x\times3=4,5\)
\(x=4,5\div3\)
\(x=1,5\)
\(\left(2,6:0,2+1,5\times2\right):2-7\dfrac{1}{2}:\dfrac{3}{2}\)
\(=\dfrac{\left(13+3\right)}{2}-\dfrac{15}{2}\times\dfrac{2}{3}\)
\(=\dfrac{16}{2}-\dfrac{15}{3}=8-5=3\)
a)(2,6:0,2+1,5x2):2-7
=(13+3):2-7
=16:2-7
=8-7
=1
b)1/2:3/2
=1/2x2/3
=1/3